Silicone admixture and cured product of the same

Abstract

It is an object of the present invention to provide a silicone rubber compatible with human bodies. A silicone admixture according to the present invention comprises a millable silicone rubber, a silicone high polymer having no cross-linking site, a vulcanizing agent, and a rubber reinforcing silica. A cured product obtained by curing the silicone admixture has loss tangent (Tan δ) of 0.3 or more and 0.6 or less at 0° C. to 50° C. The millable silicone rubber can be a millable silicone rubber produced in a wet manner and having high tear resistance. The silicone high polymer can be a dimethyl silicone high polymer.

The invention claimed is: 
     
       1. A silicone admixture, comprising:
 a millable silicone rubber, a silicone high molecular weight polymer having no cross-linking site, a vulcanizing agent, and a rubber reinforcing silica, 
 wherein the millable silicone rubber is a polyorganosiloxane composition containing vinyl groups, 
 wherein the silicone admixture comprises 0.1 parts or more by weight and 3.6 parts or less by weight of the rubber reinforcing silica based on 100 parts by weight of the total of the millable silicone rubber and the silicone high molecular weight polymer, and 
 wherein the silicone admixture is capable of becoming a cured product having loss tangent (Tan δ) of 0.3 or more and 0.6 or less at 0° C. to 50° C. by being heated to cross-link the millable silicone rubber. 
 
     
     
       2. The silicone admixture according to  claim 1 , wherein the silicone high molecular weight polymer is a dimethyl silicone high polymer. 
     
     
       3. The silicone admixture according to  claim 1 , wherein the vulcanizing agent is a peroxide based vulcanizing agent. 
     
     
       4. The silicone admixture according to  claim 1 , further comprising an organosilicone based lubricant. 
     
     
       5. The silicone admixture according to  claim 1 , wherein the silicone admixture comprises 40 parts or more by weight of the silicone high molecular weight polymer based on 100 parts by weight of the total of the millable silicone rubber and the silicone high molecular weight polymer. 
     
     
       6. A cured product of the silicone admixture according to  claim 1 . 
     
     
       7. The silicone admixture according to  claim 1 , wherein the millable silicone rubber has high tear resistance, tear strength of which is 30 N/mm (kgf/cm) or more. 
     
     
       8. The silicone admixture according to  claim 1 , wherein a hardness of the millable silicone rubber is 20 or more and 90 or less (type A durometer), or 20° or more and 90° or less (JIS-A type).